Linux File Permission Octal Reference for chmod

Posted on 2014-11-15 in  linux

I used Linux for years without bothering to find out how the chmod numbers worked. Turns out its very simple, and much faster to use than the "human" way of -u, -o, -g.

4 read (r)
2 write (w)
1 execute (x)

Position 1: Owner
Position 2: Group
Position 3: Everyone

So: 640 is Owner=Read (4+2), Group=Read (4), Everyone=None (0)

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